I'm so sorry, but things do get better, eventually. It is the Valentine's Day that triggered you, and unfortunately, there will be more days that will trigger you. Birthdays . . . anniversaries . . .
Locations may start triggering you too.
What helps me is to embrace the pain. It is ok to cry, to let it out.
Last week, I drove to a park and remembered the time my ex and I spent. I choked up because he was not there with me. But next time I went, it was just the location I really really love.
Valentine's Day? Well, my ex has never really been into romantic stuff. I guess I should send him a thank you card for not creating any nice memories of holidays. On contrary.
But, just remember. Things will get great! And you will start rediscovering yourself.
(hugs)